Paul Zak, director of the Center for Neuroeconomic Studies at Claremont Graduate Center, and author of The Moral Molecule: The Source of Love and Prosperity, suggests that the hormone oxytocin empathic understanding, generosity (donating to charities, giving money to others in experimental situations), happiness, and trust/trustworthiness.

He verified these laboratory-based findings in real-world situations, like a wedding he attended in southern England, prior to which he drew blood samples from the wedding party.

Zak says that oxytocin can be increased by massage, dance, story-telling, prayer, engaging in social media with a loved one, and hugs.
As a result, he “prescribes 8 hugs a day” for better mood and improved “relationships of all types.”

He says that oxytocin can be inhibited by improper nurturing in childhood, stress, abuse, and by oxytocin’s antagonist, testosterone.
Known as the “selfish hormone,” testosterone is also correlated with expressions of power and leadership in the workplace.

One reason women may have challenges expressing these traits in work situations is that their average testosterone levels are ten times lower than men’s.Zak’s TED Talk